Newlands Cross Upgrade EIS - European Investment Bank

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South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement 6. SOILS, GEOLOGY AND HYDROGEOLOGY 6.1 Introduction This section describes the natural characteristics of the site of the proposed development and its immediate surroundings, in terms of bedrock geology, geomorphology, drift geology and hydrogeology. Arup Consulting Engineers An assessment is made of the likely impacts of the proposed development on these resources and where required, mitigating measures are put forward to reduce or negate the impact of the proposed development. 6.2 Methodology In determining the impact of the proposed development on the prevailing geological and groundwater conditions a number of documents and sources were referred to. A specific ground investigation was undertaken for the proposed development which provides much of the information. As no formal methodology for assessing the extent and degree of impact that the development may have on the geological and groundwater aspects of the environment exists, an approach has been adopted, based on the document produced by the Institute of Geologists of Ireland, “Geology in Environmental Impact Statements – a Guide”, September 2002 1 . This document outlines the likely impacts and potential mitigation measures for geological issues by topic, although no significance criteria are given by which the impact can be rated. The ‘Guidelines on the information to be contained in Environmental Impact Statements’, EPA 2002 2 and ‘Advice notes on current practice in the preparation of Environmental Impact Statements’, EPA 2003 3 , were also referred to. No significant assumptions were made during the assessment. The description of existing conditions was based on desk study information and ground investigation data from the general area, as outlined below. 6.2.1 Sources of Information The existing conditions within the area of the proposed development have been interpreted from both desk study information and ground investigation data. The main sources of information for the study are outlined as follows: • Archival reports on site investigations carried out in the vicinity of the site. • Environmental Protection Agency database 4 • Geological Survey of Ireland; National Draft Bedrock Aquifer map 5 • Geological Survey of Ireland; Groundwater Database 6 • Bedrock Geology 1:100,000 Scale Map Series, Sheet 16, Kildare- Wicklow. Geological Survey of Ireland. 7 • Geological Survey of Ireland borehole database 8 • Geological Survey of Ireland groundwater database 9 • Geological Survey of Ireland Groundwater Newsletter 10 . • The Department of Communications Marine and Natural Resources; Exploration and Mining Division website 11 . December 2007 Page 95
South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement Arup Consulting Engineers • General Soil Map of Ireland 2nd edition 12 . • Ordinance Survey of Ireland; Historic Maps of Ireland 13 . • IGSL Ltd. Improvements to Newlands Cross Site Investigation, Factual Geotechnical Report. Fieldwork undertaken from November 2005 to February 2006. • Minerex Geophysics Ltd. Improvements at Newlands Cross Junction Dublin, Geophysical Survey. 6.3 Existing Soils, Geology and Hydrogeology 6.3.1 Surficial Deposits This sub-section deals with essentially unconsolidated material overlying bedrock. In this area the soils include topsoil, made ground, and glacial drift deposits. Drift is a general term applied to all mineral material (clay, silt, sand, gravel and boulders) transported by a glacier and deposited directly by, or from, the ice, or as fluvioglacial deposits deposited by water coming from the ice. It generally applies to deposits laid down during the Pleistocene (Quaternary) glaciations. The drift geology of the area principally reflects the depositional process of the last glaciation. Typically during the ice advance boulder clays were deposited sub-glacially as lodgement till over the eroded rock head surface, whilst moraine deposits were laid down at the glacier margins. Subsequently, with the progressive retreat of the ice sheet from the region, granular fluvio-glacial deposits were laid down in places by melt waters discharging from the front of the glacier. The Teagasc Subsoils map 14 describes the area around Newlands Cross as being underlain by either made ground or glacial till chiefly derived from limestone. The soils maps available from the EPA describe the area as having a covering of made ground or various soil types including grey/ brown Podzolics, surface water Gleys, Renzinas or Lithosols. A ground investigation was undertaken by IGSL Ltd. from November 2005 to February 2006. This work was carried out at the request of South County Dublin County Council and comprised the following: • 5 No. Cable percussion boreholes, • 9 No. Rotary core drillholes, • 12 No. Trial pits, • 1 No. Rock excavatability trial, • Seismic Refraction and Ground Penetrating Radar Geophysical Surveying, • Soil laboratory testing. • Rock Laboratory testing. The ground conditions as encountered in this investigation are as laid out in the table below. December 2007 Page 96
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PLATES
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APPENDIX A5 - TRAFFIC AND TRANSPORT
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South Dublin County Council Newland
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0 kilometres 2 Scale N.T.S Ordnance
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APPENDIX A8 - NOISE AND VIBRATION
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APPENDIX A9 - AIR QUALITY
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APPENDIX A11 - ECOLOGY
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APPENDIX A12 - ARCHAEOLOGY, ARCHITE
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Newlands Cross Upgrade EIS - European Investment Bank

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